a=-0,2
b=-7
⇒
[m]x_{o}=-\frac{(-7)}{2\cdot (-0,2)}[/m]
[m]x_{o}=-\frac{7}{0,4}[/m]
[m]x_{o}=-\frac{35}{2}[/m]
[m]y_{o}=–0,2\cdot x^2_{o}–7\cdot x_{o}+19[/m]
[m]y_{o}=–0,2\cdot (-\frac{35}{2})^2_{o}–7\cdot -\frac{35}{2}+19[/m]...считайте